Pan-and-roller mill



('No Model.) @Sheets-Sheet 1.

N. POSSATI. PAN AND ROLLER MILL.

Pat nt iXfi m V (Mm g j IQAIGWM ANDREW EJERAHAMPHOTO mm) WASNINGTONJIC(No Model.) 4 Sheets-Sheet 2 N. .FOSSATI. PAN AND ROLLER MILL.

No. 559,170. PatentedApr.28,1896.-

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ANDREW B GRAHAM, PHOTO UIND WASIINGTOILDL (No Model.) I 4 She ets-Sheet3. N.FOSSA-TI. f PAN AND ROLLER MILL.

No. 559,170. Patented Apr. 28,1896;

AN DREW BSRAHAMRHUTWUIHQWASMINGTUN. DC

(No Model.)

4 Sheets-Sheet 4' N. FOSSATI. 4 PAN AND ROLLERMILL.

No. 559,170. Patented Apr. 28, L896.

ANPIEW RGEWAM' PHOTO'U'IHD-WASKINGTOMIF UNITED STATES PATENT OFFICE.

NIOOLA FOSSATI, OF SMITHS FLAT, CALIFORNIA.

PAN-AND-ROLLER MILL.

SPECIFICATION forming part of Letters Patent No. 559,170, dated April28, 1896. Application filed June 4, 1895. Serial No. 551,649. (Nomodel.) I

To all whom it may concern..-

Be it known that I, NICOLA FOSSATI, a citizen of the United States,residing at Smiths Flat, El Dorado county, State of California, haveinvented certain new and useful Improvements in Roller-Mills, of whichthe following is a specification.

My invention relates to improvements made in thatclass or description ofpan-and-roller mills in which the pan is caused to revolve beneath therollers, while the rollers, being mounted to rotate on horizontal axles,are stationary as to position in the pan.

The object of these improvements is to overcome several defects andobjections existing in mills of this description that me. great measurehave prevented the successful em} ployment and practical use of suchmills for reducing metalliferous ores to pulp, and es pecially toproduce a strong, durable, and lighter-running mill that is capable ofbeing operated at comparatively small expense.

To such ends and object my said invention consists in the constructionand combination of parts and the production of an improved ore-crusherof the before-mentioned class, as hereinafter fully explained and setforth, reference being had to the drawings that accompany and form partof this specification.

In the said drawings, Figure 1 represents, in side elevation, aroller-mill constructed according to my said invention, a portion of therevolving pan and the stationary sluice being broken away to show theirconstruction more clearly. Fig. 2represents the same in plan or topview. Fig. 3 is an elevation of the pan and rollers, taken from theleft-hand side of the mill, as represented in Fig. 1, the revolving panand stationary trough being shown in vertical section and thedrivinggear and the supporting-frame being out off.

Fig. 4 is a View in perspective of one of the supporting-frames andsliding part thereon on which the roller-axle is mounted.

A indicates the pan, in mills of this class sometimes termed the mortar.B is a stationary sluice set on bed-timbers X X under the rim of thepan, and O C are two crushing and pulverizing wheels or rollers onhorizontal axles placed on opposite sides of the upright central shaftD,that gives motion to the pan.

E E are scrapers that control the material on the dies or thepulverizing-surface of the pan during the operation of the mill. F is adrum or band-wheel, with a bottom flange F fixed on the upright shaft,to which the drivingpower is applied by a belt from a suitablepower-shaft. These parts of the mill, as regards their generalarrangement, are similar to those found in roller-mills of this class;but with regard to the particular construction each part differs inseveral respects from those in existing mills.

The revolving pan A has a raised center a with the fixed shaft orspindle D extending throughit, and a flaring rim o in which are openingsa covered by removable screens a Above and below the edges of thescreen-openings are outwardly-projecting ledges or ribs a on theexternal face of the pan-rim; but the inner surface of the rim is smoothor without projections. Between the standing center of the pan and theflaring rim a flat-faced annular die A fixed on the bottom of the pan,forms the crushing and pulverizin g surface. A suitable step and bearingGfor the end of the pan-spindle is set under the center of the pan onthe bed-timbers, and a box H on an overhead timber Y of the frame overthe pan supports the upper end of the spindle. In these two bearings GHthe pan-spindle is fitted to revolve with the least friction. The drumor pulley is fixed on that portion of the spindle above the upperbearing H, and consequently the pulling force of the drivingbelt doesnot affect the perpendicularity of the spindle.

The stationary sluice Bis an annular trough formed with an open center,an inner rimB and an outer rim 13 extending all around the circle of thepan, excepting at the front of the mill, at which part the sluice isextended outwardly with straight-standing sides to form the chute ordischarge-spout B The bottom of the sluice has a slight pitch orinclination downward to the outlet B before mentioned, and the outermoststanding side 13 extends upwardly to a point above the projecting flangea over the screened openings, so that the bottom edge of that flangelies within the rim of the sluice, and in like manner the lower flangeon the pan-rim sets within the inner flange B of the sluice; The objectof this construction and arrangement of revolving pan and stationarysluice is to catch and confine all the pulverized material as it isdischarged from the pan by the centrifugal motion and to direct it intothe sluice without waste.

The rollers C crush and pulverize, by virtue of their weight, as the oreor substance fed into the pan is brought under the rollers by therevolving motion of the pan. Each roller is fixed on an axle I,extending horizontally from one side of the roller, and bearin gs inboxes K K are arranged for the shaft on the stationary frame at one sideof the pan.

The axle of each roller is thus carried and supported only on the outerside of the roller and independently of the pan or centraldriving-spindle.

The frame or stationary support for the axle-boxes of each roller isconstructed of two parallel standards or posts L L which are bolted downat the feet to the bed-timbers and are secured at the upper ends tocross-timbers of the framework. These uprights are strengthened andbraced by a curved standard L, that is placed behind the inner one ofthe standards L and is secured at the foot to the bed-timbers and at thetop to the crosstimber. Such inner post is set to extend from abovedownward within the rim of the pan and is supported in that positionclose up to the face of the roller by the outer standards L and L andthe connecting rigid bars or braces L Two boxes for the axle of theroller are provided on a sliding plate or carriage K, that isconstructed to slide evenly up and down on the uprights L L withalimitedextent of movement, the axle being thereby supported by one box at apoint close up to the face of the roller and by the other box at theouter end of the axle. The effect of this construction is to secure thetrue horizontal position of the axle during work and to resist orovercome the angular strains or 1 forces that are thrown upon the axleby the perpendicular or lateral movements of the roller, such as areproduced by the material 1 being carried against and beneath the rollerby the revolutions of the pan.

top and bottom of the carriage in line with the boxes, which are fittedto slide smoothly in the guides on the uprights. This constructionprovides for a limited play of the roller in a vertical direction in thepan and at the same time secures the true horizontal position of theaxle under varying conditions of work. In this way the roller-bearingsare brought entirely outside the pan and are detached altogethertherefrom, as well as from the central upright driving-shaft, so thatthe bearings of that shaft are not affected by the angular strainsthrown upon the rollers and their supports. The rollers are supported inthis way at the outer'sides only and entirely outside of, as well asindependently of, the pan. They are also detached and entirely separatefrom the upright spindle.

The construction of axle-boxes, sliding carriage, and supporting-frameis the same for both rollers.

The scrapers E are supported from horizontal bars attached to thestationary frame and have qualities of adjustability by which they canbe set to stand at different angles across the annular dies and also atdifferent heightswith respect to the surface of the dies.

A scraper is set in front of each roller and is adjusted to such anangle across the dies that the material as it is fed into the pan isproperly distributed under the roller and constantly thrown from theouter portion to the inner portion of the dies or in the directioncontrary to that in which the centrifugal force tends to throw it,thereby directing the material toward the center of the pan and underthe center of the rollers.

The scraper is formed of a blade E, attached to the lower end of adepending arm E, which at its upper end is attached to the stationarysupporting-bar E over the pan. The arm E is secured to the fixedhorizontal bar E by means of a clamp and bolts, so that it is adjustable both vertically by raising or lowering the arm and in an angulardirection by turning the arm upon itself in the clamp. Thus the scraperE is adjusted both vertically with relation to the surface of the die inthe pan and also at different angles by turning the arm E in the clamp.

Power is best applied to the pan by a belt and a flanged pulley, ordrum, as it is sometimes called, the application of the power being madeto advantage through the arrangement of a power-shaft and counter-shaftillustrated in Figs. 1 and 2, where 1 indicates the power-shaft, 2 acounter-shaft, and 3 4: two pulleys for a belt 5, connecting the twoshafts. On the shaft 2 is a pulley, from which a quarter-twist belt iscarried to the drum on the pan-spindle. These parts have bearings in asupplementary frame Z Z at i the front side of the pan.

The carriage, or part on which are set the axle-boxes, is attached toand confined on the 1 two supports L L by means of the stirrups orguides L and the narrow bars K on the Usually the rollers are covered bystationary hoods or casings WV, that extend at the rear quite close tothe pan and upward over the tops to prevent the water and pulp frombeing thrown off the rim of the rollers. These casings are supportedfrom the frames L at the sides.

Having thus fully described my invention, what I claim as new therein,and desire to secure by Letters Patent, is-

1. The improved crushing-mill, consisting of a suitable stationary bed;the stationary annular trough having standing inner and outer rims, theinner one of which is of less height than the outer one; the revolvingpan having a closed center, a flaring outer rim provided withscreen-covered openings and having projecting flanges on the outer facethereof above the top line and below the bottom line of said openings,the said flanges being inclined downwardly and outwardly and extendingwithin the standing rims of the stationary trough; the upright revolubleshaft to which said pan is secured and by which it is supported, andmeans applied to said shaft to revolve the pan; crushing-rollers mountedstationary annular trough having standing rims the inner one of which isof less height than the outer one; with the revoluble pan having aclosed bottom and a flaring rim provided with screen-covered openingsand the projecting flanges on the outer face of said rim above and belowthe said openings, the said flanges being inclined downwardly andoutwardly at an angle to overhang the inner rim of the trough and toextend within and below the top edge of the outer rim of said 30 troughIn testimony that I claim the foregoing I have hereunto set my hand andseal.

NICOLA FOSSA PI. [L. s.]

Witnesses CHARLES OREL PRENTISS CARPENTER.

